UPDATE 9:50 p.m. EDT: New York real estate scion Robert Durst can be heard muttering, "Killed them all, of course," in the finale of the HBO docu-series "The Jinx," which aired Sunday. Durst was arrested Saturday for first-degree murder in the death of his friend Susan Berman.

When Durst acknowledged similarities between handwriting on an envelope a note alerting authorities to the whereabouts of Berman's body, he could be heard saying, "There it is. You're caught," the Los Angeles Times reported, although he denied writing the note to police. He also said, "What a disaster," after the final interview for the show.

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Robert Durst’s documentary series “The Jinx” wraps up Sunday night on HBO, but the case is far from over for Durst. He was arrested Saturday night on first degree murder charges, NBC reported.

Durst, 71, was arrested in Louisiana on a warrant from Los Angeles County, according to his file on the Orleans Parish Sheriff’s Office website. He appeared in magistrate court Sunday and was held without bail, NBC reported. Durst is expected to make another court appearance on Monday. While Durst will not fight extradition, he will fight the murder charges, attorney Chip Lewis told ABC

The New York Times reported police reopened the investigation into the death of Susan Berman. Of course, her case is one of a few options. The only killing for which Durst has been on tried was that of Morris Black, who was shot to death. Durst claimed it was self-defense in the 2001 trial, and he was acquitted. The real-estate heir was also a suspect in the 1982 disappearance of his first wife, Kathleen Durst, as well as the 2000 killing of his friend Berman.

So why is Durst being brought up on charges now? He is currently the subject of the HBO series, “The Jinx: The Life and Deaths of Robert Durst.” The six-part docu-series examines the evidence in these cases. While they may have seemed like cold cases for some time, the New York Times reported the investigation has been ongoing and witnesses were interviewed fairly recently. The Times reported investigators from Los Angeles, the Federal Bureau of Investigation agents and New York State Police interviewed witnesses in New York.

The fifth episode of “The Jinx” reportedly brought new evidence to light. Berman’s stepson found a letter from Durst to Berman. The handwriting on the letter looks similar an anonymous letter that told the police where Berman’s body was. The block letters are very similar and both misspell Beverly as “Beverley.”

The final episode of “The Jinx: The Life and Deaths of Robert Durst” airs Sunday at 8 p.m. EDT on HBO.